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diff --git a/media/libvpx/libvpx/vp8/decoder/ec_types.h b/media/libvpx/libvpx/vp8/decoder/ec_types.h
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+/*
+ * Copyright (c) 2011 The WebM project authors. All Rights Reserved.
+ *
+ * Use of this source code is governed by a BSD-style license
+ * that can be found in the LICENSE file in the root of the source
+ * tree. An additional intellectual property rights grant can be found
+ * in the file PATENTS. All contributing project authors may
+ * be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef VPX_VP8_DECODER_EC_TYPES_H_
+#define VPX_VP8_DECODER_EC_TYPES_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define MAX_OVERLAPS 16
+
+/* The area (pixel area in Q6) the block pointed to by bmi overlaps
+ * another block with.
+ */
+typedef struct {
+ int overlap;
+ union b_mode_info *bmi;
+} OVERLAP_NODE;
+
+/* Structure to keep track of overlapping blocks on a block level. */
+typedef struct {
+ /* TODO(holmer): This array should be exchanged for a linked list */
+ OVERLAP_NODE overlaps[MAX_OVERLAPS];
+} B_OVERLAP;
+
+/* Structure used to hold all the overlaps of a macroblock. The overlaps of a
+ * macroblock is further divided into block overlaps.
+ */
+typedef struct {
+ B_OVERLAP overlaps[16];
+} MB_OVERLAP;
+
+/* Structure for keeping track of motion vectors and which reference frame they
+ * refer to. Used for motion vector interpolation.
+ */
+typedef struct {
+ MV mv;
+ MV_REFERENCE_FRAME ref_frame;
+} EC_BLOCK;
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+#endif // VPX_VP8_DECODER_EC_TYPES_H_